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OvO pairs the N classes in pairs to generate N (N-1)/2 binary classification tasks. For example, OvO will train a classifier to distinguish classes Ci and Cj. The classifier takes the Ci class sample in D as a positive example and the Cj class sample as a counterexample. In the testing phase, the new samples will be submitted to all classifiers at the same time, so we will get N (N-1)/2 classification results, and the final results can be generated by voting: that is, the category that is predicted most is taken as the final classification result. Figure 3.4 shows a schematic diagram.Age: 12Invoke invokes the delegate's instance method to execute the methodOnly the outer world is special.该片主要讲述了小镇理发店老板老马的女儿小满在大学毕业之际，带着几个大学同学来到小镇上，却在理发店内遭遇了一系列离奇事件的惊悚故事。老马开着一个理发店。女儿小满要毕业了，带着几个大学同学来到老马家，却在理发店内遭遇了一系列离奇的故事……李元是阐教嫡系，阐教向来人多势众，又极为护短。